Aristov test gist 03.13.2018

Program.cs

using System;
using System.Text;
using static TestApp.Program.DnaPath;

namespace TestApp
{
    class Program
    {
        internal enum DnaPath
        {
            A, T, C, G
        }

        static string DnaToString(DnaPath[] src)
        {
            if (src == null || src.Length == 0)
                throw new Exception();
            StringBuilder builder = new StringBuilder();
            foreach (var path in src)
                switch (path)
                {
                    case A:
                        builder.Append('A'); break;
                    case T:
                        builder.Append('T'); break;
                    case C:
                        builder.Append('C'); break;
                    case G:
                        builder.Append('G'); break;
                }
            return builder.ToString();
        }
        static DnaPath[] Compliment(DnaPath[] src)
        {
            if (src == null || src.Length == 0)
                throw new Exception();
            DnaPath[] temp = new DnaPath[src.Length];
            for (int i = 0, stop = src.Length; i < stop; i++)
                switch (src[i])
                {
                    case A:
                        temp[i] = T; break;
                    case T:
                        temp[i] = A; break;
                    case C:
                        temp[i] = G; break;
                    case G:
                        temp[i] = C; break;
                }
            return temp;
        }

        static int Chartohex(char src)
        {
            switch (src)
            {
                case 'a': return 0xa;
                case 'A': return 0xa;
                case 'b': return 0xb;
                case 'B': return 0xb;
                case 'c': return 0xc;
                case 'C': return 0xc;
                case 'd': return 0xd;
                case 'D': return 0xd;
                case 'e': return 0xe;
                case 'E': return 0xe;
                case 'f': return 0xf;
                case 'F': return 0xf;
                default: throw new Exception();
            }
        }
        static int Fish(string src)
        {
            if (string.IsNullOrEmpty(src))
                throw new Exception();
            int temp = 0;
            foreach(char item in src)
                try
                {
                    temp ^= Chartohex(item);
                }
                catch
                {
                    // ignored
                }

            return temp;
        }

        static void Main(string[] args)
        {
            Console.WriteLine(DnaToString(Compliment(new[] { T, A, C, G, T, A, G, G, C, T, A })));
            Console.WriteLine(DnaToString(Compliment(new[] { G, A, C, A, C, A, C, G, A, T, C })));
            Console.WriteLine(Fish("asdoiguvaoysvvBPSDPVIOVASYUVEPSFNAjhvaevwuhzblsdvahsvdo"));
            Console.WriteLine(Fish("hasceccarcyeacsyradtxcyrcetacyescdtracsdutarsduatyc"));
            Console.ReadKey();
        }
    }
}